How to inherit from RadTextBox? in UI for ASP.NET AJAX Input

Zdeněk

27 posts

Member since:
May 2007

Posted 15 Feb 2010 Link to this post

I want to extend RadTextBox by implementing RequiredFieldValidator. I did simillar functionality with asp:textbox :

    
            Public Class MyTextBox 
        
                    Inherits WebControls.TextBox 
        
                    Private req As New RequiredFieldValidator 
        
                    Protected Overrides Sub OnInit(ByVal e As EventArgs) 
        
                        req.ControlToValidate = Me.ID 
        
                        req.Display = ValidatorDisplay.Dynamic 
        
                        req.ErrorMessage = "Please fill marked field(-s)" 
        
                        req.Text = "*" 
        
                        req.EnableClientScript = True 
        
                        Controls.Add(req) 
        
                    End Sub 
        
                    Protected Overrides Sub Render(ByVal w As HtmlTextWriter) 
        
                        MyBase.Render(w) 
        
                        req.RenderControl(w) 
        
                    End Sub 
        
             End Class

When I want to inherit from RadTextBox (at line 2: Inherits Telerik.Web.UI.RadTextBox), code stops working with weird error:

Unable to find control id 'txtTest' referenced by the 'ControlToValidate' property of ''.

What I'm doing wrong? Thank you for your help!

Zdenek

Pavel

Admin

904 posts

Posted 17 Feb 2010 Link to this post

Hi Zdenek,

I am afraid that inheriting from RadTextBox in that way is not supported due to limitation that prevents the Validator from getting the correct ID. You can try inheriting from WebControl instead and putting the RadTextbox and its validator inside it.

Best wishes,
Pavel
the Telerik team

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Zdeněk

27 posts

Member since:
May 2007

Posted 17 Feb 2010 Link to this post

Thank you. Most needed functionality will bring me RadInputManager.